asp.net listbox and image

protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (lstListbox.SelectedIndex == 0)
            {
                imgImageBox.ImageUrl = "~/Images/Apple.jpg";
            }
            if (lstListbox.SelectedIndex == 1)
            {
                imgImageBox.ImageUrl = "~/Images/orange.jpg";
            }
            if (lstListbox.SelectedIndex == 2)
            {
                imgImageBox.ImageUrl = "Images/mango.jpg";
            }
        }

For Example list box contain apple,orange ,mangos, on clicking apple i have to display image of apple in image box,if orange its image...

clearly mention your need.
is it you want to display the item have selected or just image